left and right socd

Hi there!
I’m using a Hitbox built on the GP2040 firmware and have a feature request for SOCD (Simultaneous Opposite Cardinal Directions) mode customization.
As the firmware already supports Up Priority (a.k.a. Stickless), Neutral, and Second Input Priority modes, I won’t dive into existing behaviors—you likely know them inside out! My ask is simple: could you implement a new SOCD mode where:
Left/Right: Follow the mutual override logic (consistent with how opposite horizontal directions work in Second Input Priority), with no neutral output when pressed simultaneously.
Up/Down: Default to neutral (center position) when pressed together (matching the behavior of the Neutral mode for vertical directions).
In short, this mode would combine horizontal override (Left/Right) and vertical neutral (Up/Down) behaviors. It’d be a great addition for players who prefer distinct SOCD rules for horizontal and vertical inputs.
Thanks a ton for your incredible work on the GP2040 firmware—we really appreciate it!
Best regards,
（I wrote this using translation software, and I apologize for any misunderstanding.）

The issue does not name implementation files or tests. Start by locating the existing SOCD mode handling and its tests, then compare Second Input Priority horizontal behavior with Neutral vertical behavior. Done means a selectable mode combines horizontal mutual override with neutral output for simultaneous Up/Down inputs, with coverage for both direction pairs.